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Thanks everyone for your responses.The tech returned and this time found a leak in the AC Coil.Will cost over $$$$ :rolleyes: to repair but I'm glad that he found the issue.

Thanks for your reply.

Do you think that the valve stem is the main culprit (2.5 pounds in three weeks) or an undetected leak elsewhere?

I called a tech three weeks ago due to ice in the system and with the unit not cooling.He tested for leaks and only found a very small leak at the valve stem, which he didn't even repair instead he...